公开(公告)号：US20170211164A1

公开(公告)日：2017-07-27

申请号：US15329117

申请日：2015-06-10

Applicant: JFE STEEL CORPORATION

Inventor： Hideyuki KIMURA ,  Hiroshi HASEGAWA ,  Noriaki KOHSAKA ,  Mai AOYAMA

IPC: C21D9/46 ,  B32B15/01 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C21D8/02 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B21B1/22

CPC classification number: C21D9/46 ,  B21B1/22 ,  B21B2001/221 ,  B21B2001/225 ,  B32B15/013 ,  B32B2255/06 ,  B32B2255/205 ,  B32B2307/536 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C18/00 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/26 ,  C23C2/28

Abstract: A high strength galvanized steel sheet that has a tensile strength (TS) of 780 MPa or higher and excellent bendability, fatigue resistance, and surface appearance quality and a method for producing the high strength galvanized steel sheet. The steel sheet includes, at a position ½ of a thickness of the steel sheet, 5% or more and 80% or less of a ferrite phase in terms of area fraction, 20% or more and 70% or less of a martensite phase in terms of area fraction, and 0% or more and 25% or less of a bainite phase in terms of area fraction.

公开(公告)号：US20160304982A1

公开(公告)日：2016-10-20

申请号：US15103495

申请日：2014-12-11

Applicant: JFE STEEL CORPORATION

Inventor： Yoichi MAKIMIZU ,  Yoshitsugu SUZUKI ,  Mai AOYAMA ,  Hiroshi HASEGAWA ,  Gentaro TAKEDA

IPC: C21D9/46 ,  C23C2/40 ,  C23C8/14 ,  C21D1/26 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C23C2/06 ,  C23C8/80

CPC classification number: C21D9/46 ,  C21D1/26 ,  C21D1/74 ,  C21D8/04 ,  C22C18/04 ,  C22C38/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C23C8/14 ,  C23C8/80

Abstract: A method for producing high-strength galvannealed steel sheets having excellent workability and fatigue resistance. The method comprises subjecting a steel sheet to an oxidation treatment, the oxidation treatment including heating the steel sheet in an upstream stage at a temperature in the range of 400° C. to 750° C. in an atmosphere having an O2 concentration of not less than 1000 ppm by volume and a H2O concentration of not less than 1000 ppm by volume and a downstream stage at a temperature in the range of 600° C. to 850° C. in an atmosphere having an O2 concentration of less than 1000 ppm by volume and a H2O concentration of not less than 1000 ppm by volume. The method further comprises subjecting the steel sheet to reducing annealing, hot-dip galvanizing treatment and alloying treatment.

Abstract translation: 一种制造具有优异的加工性和耐疲劳性的高强度合金化热浸镀锌钢板的方法。 该方法包括对钢板进行氧化处理，所述氧化处理包括在O2浓度不低于的气氛中，在400℃至750℃范围内的温度下在上游阶段加热钢板 在氧浓度小于1000ppm的气氛中，在600℃至850℃的温度范围内，在1000体积％以上的H 2 O浓度和不低于1000ppm体积的H 2 O浓度以及下游阶段， 体积和不小于1000ppm体积的H 2 O浓度。 该方法还包括对钢板进行减少退火，热浸镀锌处理和合金化处理。